Clam AntiVirus
Open SourceClam AntiVirus (ClamAV) is a free, open-source antivirus engine designed for scanning emails, files, and directories for various types of malicious software, including viruses, worms, and Trojans.
Key Features
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Free and open-source, no licensing costs
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Excellent for server-side scanning, especially email
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Flexible command-line interface allows for automation and integration